Our cattle-panel "wood shed." I've got a little over $100 into it.
3 cattle panels -roughly $60.00
2x4s to make a 9.5'x12' frame - less than $20. (I had some kicking around already)
5-8' treated posts. Cut 3 in half to make 4' posts (2' buried) to support the frame. Used the other two to hold up the ridge pole. (18"-ish buried) $25-ish, +/-
The tarp is a pipe-frame canopy that our scout troop was throwing out due to a big slice in it. I saved it from the dumpster and some gorilla tape fixed it well enough for this purpose.
It's 9.5'x12', roughly 6.5. At the peak. Frame is suspended about 1 foot off the ground. Floor is a bunch of pallets.
Version 1 was last year. MUCH better than dealing with tarps, although it did partially collapse under a heavy snow wet snow load. Version 2.0 features the ridgepole and elevated frame.
It's almost empty in this picture. It's about half full now. More wood on the way!